DESTDIR duplication in version 1.6.1

[Sergey Poznyakoff]

Hello,

When installing into a separate destination directory, adns 1.6.1
duplicates the destination prefix set by DESTDIR.  E.g. after

  make install DESTDIR=/tmp/a

the following directory hierarchy is created:

  /tmp/a/tmp/a
  /tmp/a/tmp/a/usr
  /tmp/a/tmp/a/usr/lib
  ...  

That's because the lines 53-58 in common.make.in prefix each path
variable with the value of $DESTDIR, and then the actual installation
goals at src/Makefile.in:28-34 and dynamic/Makefile.in:28-32 prepend
the same value another time.  Attached are two possible fixes.

Another minor problem is that the rule in common.make.in:70 causes
creation of a directory named 755 in src/ and dynamic/ during make
install.  These patches address this as well.

Best regards,
Sergey

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